Add support for quick transcode (copy video stream or skip processing) and white space removal done by editor.
Add audio-bitrate and audio-bitrate-copy options so maximum bitrate can be clamped. Audio transcodings will always use the next largest (or equal) standard bitrate per channel [48, 64, 80, 96, 128, 160]. If audio-bitrate is set the next largest standard bitrate from this setting will be used instead. If audio-bitrate-copy is set then an audio stream with a bitrate exceeding this value will be transcoded by force to match this setting.